CN103909099A - Method for eliminating shear cracks of steel sections of sucker rods - Google Patents
Method for eliminating shear cracks of steel sections of sucker rods Download PDFInfo
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- CN103909099A CN103909099A CN201310303494.6A CN201310303494A CN103909099A CN 103909099 A CN103909099 A CN 103909099A CN 201310303494 A CN201310303494 A CN 201310303494A CN 103909099 A CN103909099 A CN 103909099A
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Abstract
The invention provides a method for eliminating shear cracks of steel sections of sucker rods. The method includes the steps: setting rolling starting temperature; rolling; controlling finishing; shearing the steel; stacking rod bundles. 20Cr2Mo steel is taken as an example, the rolling starting temperature of the steel with the diameter phi 19 is 1080-1120 DEG C, and the rolling starting temperature of the steel with the diameter phi 22-28 is 1070-1110 DEG C. The frame speed of finished steel with the diameter phi 19-28 is 7.5-8.0 meters per second, specified lengths are multiplied according to a multiple length, top cropping and back-end cropping quantities are added, and the length of the finished steel is 80-87 meters. The stepping cycle of a cold bed is 3.4 seconds, a step is reserved between an upper cold bed multiple length and the multiple length of the steel with the diameter phi 19-28, residence time is shortened, and the multiple length steel temperature is higher than or equal to 350 DEG C. After the multiple length contracts with cold, the upper limit deviation value is controlled to range from -10mm to +0mm. The gap value of shear blades is 0.05-0.18mm. The rod bundles are stacked and covered with canvases for slow cooling, and the cracks of the sections are avoided.
Description
Technical field
The present invention relates to eliminate sucker-rod steel shearing area crack technology, be particularly useful for the use of 20Cr2Mo steel grade.
Background technology
In the time of trial production, produce 20 tons of 20Cr2Mo sucker-rod steels, all having there is serious shear fissure in sucker-rod steel section, has not only increased user cost, affects the enthusiasm for production of enterprise, once stopped production.For the benefit of enterprise, engineering department combines tackling key problem, solves production practices problem.Now compared with the prior art: open rolling steel temperature 1020-1060 DEG C; 12.5 meters of rolling φ 19 finished frame speed, 11.5 meters of φ 22 finished frame speed, 9 meters of φ 25 finished frame speed, 8.5 meters of φ 28 finished frame speed; Finishing cold bed stepping period is set 5 seconds, and not empty step between cold bed multiple length and multiple length on φ 19-φ 28, cuts front multiple length steel temperature 160-240 DEG C; Steel cutting: upper and lower blade clearance value: 0.2-0.4mm; After piling, rod bundle end is protected, and consequently crackle degree reaches 100%.
The present invention is from improving heating-up temperature, be beneficial to the evenly diffusion in steel of the alloying element such as chromium, molybdenum, reduce segregation in finished product material microstructure, the parameter adjustments such as Negotiation speed, multiple lengths, cold bed stepping period, the empty step of multiple length, improve shear temperature, blade clearance reduces, and object reduces residual stress while shearing, and rod bundle is concentrated piling, cover canvas slow cooling, shear the technical measures such as residual stress, the slow release of cooling stress and start with, the method for employing has one's own knack, and has reached former designing requirement.
This method is suitable for continous way and produces You Gang enterprise, and the production of domestic excellent steel is had to high exemplary role.
Summary of the invention
The object of the invention is to: the new method of formulation, the technical barrier of the sucker-rod steel shearing area crackle of elimination taking 20Cr2Mo steel as representative.
The object of the present invention is achieved like this: a kind of method of eliminating sucker-rod steel section shear fissure, taking 20Cr2Mo steel as example, implement step by step;
Step 1 start rolling temperature: steel diameter phi 19, start rolling temperature 1080-1120 DEG C, steel diameter phi 22-φ 28, start rolling temperature 1070-1110 DEG C;
Step 2 rolling: the gantry speed 7.5-8.0 meter per second of finished steel φ 19-φ 28, get the multiple chi of cut lengths according to multiple lengths and add cutting head cutting tail amount, get its length 80-87 rice;
Step 3 finishing:
1) cold bed stepping period is 3.4 seconds, and an empty step between the upper cold bed multiple length of φ 19-φ 28 steel and multiple length reduces the time of staying, ensures multiple length steel temperature >=350 DEG C; After cut lengths shrinkage, upper control limit deviate is-10mm～+ 0mm;
2) steel cutting: blade clearance value is 0.05-0.18mm; Steel diameter phi 19-φ 22 use 20 groove cutting edges, steel diameter phi 25 use 15 groove cutting edges, steel diameter phi 28 use 12 groove cutting edges;
Step 4 piling: rod bundle piling covers canvas slow cooling, avoids section to crack.
First the present invention determines each section of furnace temperature scope of each specification sucker-rod steel heating furnace and start rolling temperature, determine again shear temperature temperature range, finally for realizing shear temperature temperature range, determine the setting parameters such as finished product gantry speed, multiple lengths, cold bed stepping period, the empty step of multiple length, realize former target setting, shown technological progress.
Detailed description of the invention
The present invention is described further in conjunction with the embodiments.
Embodiment 1
φ 28 sucker-rod steels are produced, steel grade 20Cr2Mo;
1) heating: when normal rolling, soaking zone: upper equal 1175 DEG C, lower equal 1120 DEG C; Bringing-up section: above add 1082 DEG C, under add 1086 DEG C;
2) rolling: φ 28 finished frame speed 7.5 meter per seconds, 9.44 meters of cut lengths, multiple lengths is set as 85.5 meters;
3) finishing: cold bed stepping period is set 3.4 seconds, cold bed connects steel and changes into and connect sky one step, reduces in the cold bed time of staying, and cut lengths is sheared limit on the upper side, 9.48 meters of controls of length when cutting to length;
4) steel cutting: upper and lower blade clearance value: 0.15mm; Steel diameter phi 28 use 12 groove cutting edges;
5) in the operation of rolling, steel temperature monitoring, 1090 DEG C of start rolling temperatures (after 1# milling train), 1010 DEG C of upper cold bed temperatures, cut front roller-way temperature while cutting front roller-way shear-steel steel temperature be 400 DEG C, while being trimmed to afterbody, steel temperature is 340 DEG C;
6) piling: rod bundle is concentrated piling, after piling, rod bundle end covers canvas slow cooling, avoids wind section to crack because of cooling rate difference.
Embodiment 2
φ 28 sucker-rod steels are produced, steel grade 20Cr2Mo;
1) heating: when normal rolling, soaking zone: upper equal 1180 DEG C, lower equal 1130 DEG C; Bringing-up section: above add 1072 DEG C, under add 1095 DEG C;
2) rolling: φ 28 finished frame speed 7.6 meter per seconds, 9.49 meters of cut lengths, multiple lengths is set as 85.5 meters;
3) finishing: cold bed stepping period is set 3.4 seconds, cold bed connects steel and changes into and connect sky one step, reduces in the cold bed time of staying, and cut lengths is sheared limit on the upper side, 9.48 meters of controls of length when cutting to length;
4) steel cutting: upper and lower blade clearance value: 0.15mm; Steel diameter phi 28 use 12 groove cutting edges;
5) in the operation of rolling, steel temperature monitoring, 1080 DEG C of start rolling temperatures (after 1# milling train), 1020 DEG C of upper cold bed temperatures, cut front roller-way temperature while cutting front roller-way shear-steel steel temperature be 410 DEG C, while being trimmed to afterbody, steel temperature is 350 DEG C;
6) piling: rod bundle is concentrated piling, after piling, rod bundle end covers canvas slow cooling, avoids wind section to crack because of cooling rate difference.
Embodiment 3
φ 25 sucker-rod steels are produced, steel grade 20Cr2Mo;
1) heating: when normal rolling, soaking zone: upper equal 1170 DEG C, lower equal 1113 DEG C; Bringing-up section: above add 1074 DEG C, under add 1084 DEG C;
2) rolling: φ 25 finished frame speed 7.8 meter per seconds, 9.56 meters of cut lengths, multiple lengths is set as 87 meters;
3) finishing: cold bed stepping period is set 3.4 seconds, cold bed connects steel and changes into and connect sky one step, reduces in the cold bed time of staying, and cut lengths is sheared limit on the upper side, 9.59 meters of controls of length when cutting to length;
4) steel cutting: upper and lower blade clearance value: 0.15mm; Steel diameter phi 25 use 15 groove cutting edges;
5) in the operation of rolling, steel temperature monitoring, 1075 DEG C of start rolling temperatures (after 1# milling train), 1010 DEG C of upper cold bed temperatures, cut front roller-way temperature while cutting front roller-way shear-steel steel temperature be 380 DEG C, while being trimmed to afterbody, steel temperature is 320 DEG C;
6) piling: rod bundle is concentrated piling, after piling, rod bundle end covers canvas slow cooling, avoids wind section to crack because of cooling rate difference.
Embodiment 4
φ 25 sucker-rod steels are produced, steel grade 20Cr2Mo;
1) heating: when normal rolling, soaking zone: upper equal 1175 DEG C, lower equal 1123 DEG C; Bringing-up section: above add 1080 DEG C, under add 1090 DEG C;
2) rolling: φ 25 finished frame speed 8 meter per seconds, 9.60 meters of cut lengths, multiple lengths is set as 87 meters;
3) finishing: cold bed stepping period is set 3.4 seconds, cold bed connects steel and changes into and connect sky one step, reduces in the cold bed time of staying, and cut lengths is sheared limit on the upper side, 9.59 meters of controls of length when cutting to length;
4) steel cutting: upper and lower blade clearance value: 0.15mm; Steel diameter phi 25 use 15 groove cutting edges;
5) in the operation of rolling, steel temperature monitoring, 1080 DEG C of start rolling temperatures (after 1# milling train), 1010 DEG C of upper cold bed temperatures, cut front roller-way temperature while cutting front roller-way shear-steel steel temperature be 385 DEG C, while being trimmed to afterbody, steel temperature is 320 DEG C;
6) piling: rod bundle is concentrated piling, after piling, rod bundle end covers canvas slow cooling, avoids wind section to crack because of cooling rate difference.
Embodiment 5
φ 22 sucker-rod steels are produced, steel grade 20Cr2Mo;
1) heating: when normal rolling, soaking zone: upper equal 1180 DEG C, lower equal 1133 DEG C; Bringing-up section: above add 1080 DEG C, under add 1090 DEG C;
2) rolling: φ 22 finished frame speed 8 meter per seconds, 9.37 meters of cut lengths, multiple lengths is set as 85.3 meters;
3) finishing: cold bed stepping period is set 3.4 seconds, cold bed connects steel and changes into and connect sky one step, reduces in the cold bed time of staying, and cut lengths is sheared limit on the upper side, 9.40 meters of controls of length when cutting to length;
4) steel cutting: upper and lower blade clearance value: 0.18mm; Steel diameter phi 22 use 20 groove cutting edges;
5) in the operation of rolling, steel temperature monitoring, 1093 DEG C of start rolling temperatures (after 1# milling train), 1020 DEG C of upper cold bed temperatures, cut front roller-way temperature while cutting front roller-way shear-steel steel temperature be 380 DEG C, while being trimmed to afterbody, steel temperature is 350 DEG C;
6) piling: rod bundle is concentrated piling, after piling, rod bundle end covers canvas slow cooling, avoids wind section to crack because of cooling rate difference.
Embodiment 6
φ 22 sucker-rod steels are produced, steel grade 20Cr2Mo;
1) heating: when normal rolling, soaking zone: upper equal 1185 DEG C, lower equal 1140 DEG C; Bringing-up section: above add 1086 DEG C, under add 1093 DEG C;
2) rolling: φ 22 finished frame speed 8 meter per seconds, 9.41 meters of cut lengths, multiple lengths is set as 85.3 meters;
3) finishing: cold bed stepping period is set 3.4 seconds, cold bed connects steel and changes into and connect sky one step, reduces in the cold bed time of staying, and cut lengths is sheared limit on the upper side, 9.40 meters of controls of length when cutting to length;
4) steel cutting: upper and lower blade clearance value: 0.18mm; Steel diameter phi 22 use 20 groove cutting edges;
5) in the operation of rolling, steel temperature monitoring, 1100 DEG C of start rolling temperatures (after 1# milling train), 1030 DEG C of upper cold bed temperatures, cut front roller-way temperature while cutting front roller-way shear-steel steel temperature be 385 DEG C, while being trimmed to afterbody, steel temperature is 350 DEG C;
6) piling: rod bundle is concentrated piling, after piling, rod bundle end covers canvas slow cooling, avoids wind section to crack because of cooling rate difference.
Embodiment 7
φ 19 sucker-rod steels are produced, steel grade 20Cr2Mo;
1) heating: when normal rolling, soaking zone: upper equal 1192 DEG C, lower equal 1150 DEG C; Bringing-up section: above add 1085 DEG C, under add 1100 DEG C;
2) rolling: φ 19 finished frame speed 7.9 meter per seconds, 9.43 meters of cut lengths, multiple lengths is set as 85.8 meters;
3) finishing: cold bed stepping period is set 3.4 seconds, cold bed connects steel and changes into and connect sky one step, reduces in the cold bed time of staying, and cut lengths is sheared limit on the upper side, 9.46 meters of controls of length when cutting to length;
4) steel cutting: upper and lower blade clearance value: 0.18mm; Steel diameter phi 19 use 20 groove cutting edges;
5) in the operation of rolling, steel temperature monitoring, 1100 DEG C of start rolling temperatures (after 1# milling train), 1022 DEG C of upper cold bed temperatures, cut front roller-way temperature while cutting front roller-way shear-steel steel temperature be 360 DEG C, while being trimmed to afterbody, steel temperature is 330 DEG C;
6) piling: rod bundle is concentrated piling, after piling, rod bundle end covers canvas slow cooling, avoids wind section to crack because of cooling rate difference.
Embodiment 8
φ 19 sucker-rod steels are produced, steel grade 20Cr2Mo;
1) heating: when normal rolling, soaking zone: upper equal 1198 DEG C, lower equal 1160 DEG C; Bringing-up section: above add 1092 DEG C, under add 1105 DEG C;
2) rolling: φ 19 finished frame speed 8 meter per seconds, 9.47 meters of cut lengths, multiple lengths is set as 85.8 meters;
3) finishing: cold bed stepping period is set 3.4 seconds, cold bed connects steel and changes into and connect sky one step, reduces in the cold bed time of staying, and cut lengths is sheared limit on the upper side, 9.46 meters of controls of length when cutting to length;
4) steel cutting: upper and lower blade clearance value: 0.18mm; Steel diameter phi 19 use 20 groove cutting edges;
5) in the operation of rolling, steel temperature monitoring, 1120 DEG C of start rolling temperatures (after 1# milling train), 1030 DEG C of upper cold bed temperatures, cut front roller-way temperature while cutting front roller-way shear-steel steel temperature be 360 DEG C, while being trimmed to afterbody, steel temperature is 330 DEG C;
6) piling: rod bundle is concentrated piling, after piling, rod bundle end covers canvas slow cooling, avoids wind section to crack because of cooling rate difference.
This method has been produced more than 900 tons of four specifications of key customer Yumen oil φ 19-φ 28 sucker-rod steel since implementing from May, 2012, and the control of section shear fissure is better, and rod is tied up and only seen the fragmentary five section blind cracks of φ 19, meets contract requirement.
Claims (1)
1. eliminate a method for sucker-rod steel shearing area crackle, taking 20Cr2Mo steel as example, implement step by step;
Its 1 control start rolling temperature: steel diameter phi 19, start rolling temperature 1080-1120 DEG C, steel diameter phi 22-φ 28, start rolling temperature 1070-1110 DEG C;
Its 2 roll control: the gantry speed 7.5-8.0 meter per second of finished steel φ 19-φ 28, get the multiple chi of cut lengths according to multiple lengths and add cutting head cutting tail amount, get its length 80-87 rice;
Its 3 finishing control:
1) cold bed stepping period is 3.4 seconds, and an empty step between the upper cold bed multiple length of φ 19-φ 28 steel and multiple length reduces the time of staying, ensures multiple length steel temperature >=350 DEG C; After cut lengths shrinkage, upper control limit deviate is-10 mm～+ 0mm;
2) steel cutting: blade clearance value is 0.05-0.18mm;
Its 4 piling: rod bundle piling covers canvas slow cooling, avoids section to crack.
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| CN201310303494.6A CN103909099B (en) | 2013-07-18 | 2013-07-18 | A kind of method of eliminating sucker-rod steel section shear fissure |
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| CN201310303494.6A CN103909099B (en) | 2013-07-18 | 2013-07-18 | A kind of method of eliminating sucker-rod steel section shear fissure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104148406A (en) * | 2014-08-15 | 2014-11-19 | 内蒙古包钢钢联股份有限公司 | Double-length flying shear optimal shearing method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5994514A (en) * | 1982-11-19 | 1984-05-31 | Kawasaki Steel Corp | Method for controlling outer diameter in seizer |
| CN101152653A (en) * | 2006-09-27 | 2008-04-02 | 厦门虹鹭钨钼工业有限公司 | Method for rolling titanium and titanium alloy bar wire bar with three-roller type Y continuous rolling mill |
| CN102162067A (en) * | 2011-03-28 | 2011-08-24 | 首钢总公司 | Steel for anticorrosion sucker rods in oil field and production method thereof |
| CN102896147A (en) * | 2012-10-25 | 2013-01-30 | 西安盛日机电科技有限公司 | Large-space hole-free rolling device and rolling method of bar production line |
-
2013
- 2013-07-18 CN CN201310303494.6A patent/CN103909099B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5994514A (en) * | 1982-11-19 | 1984-05-31 | Kawasaki Steel Corp | Method for controlling outer diameter in seizer |
| CN101152653A (en) * | 2006-09-27 | 2008-04-02 | 厦门虹鹭钨钼工业有限公司 | Method for rolling titanium and titanium alloy bar wire bar with three-roller type Y continuous rolling mill |
| CN102162067A (en) * | 2011-03-28 | 2011-08-24 | 首钢总公司 | Steel for anticorrosion sucker rods in oil field and production method thereof |
| CN102896147A (en) * | 2012-10-25 | 2013-01-30 | 西安盛日机电科技有限公司 | Large-space hole-free rolling device and rolling method of bar production line |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104148406A (en) * | 2014-08-15 | 2014-11-19 | 内蒙古包钢钢联股份有限公司 | Double-length flying shear optimal shearing method |
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